#top_menu
{
   background-color: red;
   padding: 0;
   margin-bottom: 50px;
   margin-top: 0;
   margin-left: 0;
   margin-right: 0;
}

#top_menu .navigation
{
   list-style-type: none;
   background-color: blue;
}

#top_menu .navigation li
{
   float: left;
}

#top_menu .navigation li  a
{
   background-color: yellow;
}